Dormant Ekofisk Fields Set for Offshore Revival

ConocoPhillips taps Subsea7 for a major subsea project to revive three long-idled North Sea fields tied back to the Ekofisk Complex

10 Mar 2026

Oilfields rarely return from the dead. Yet in the Norwegian North Sea three reservoirs abandoned in the late 1990s are being prepared for another run. ConocoPhillips has awarded Subsea7 a contract worth as much as $500m to redevelop three “previously produced” fields near the Ekofisk Complex, one of Europe’s most important offshore energy hubs.

The project will reconnect the Albuskjell, Vest Ekofisk and Tommeliten Gamma fields to Ekofisk’s existing infrastructure, about 290km southwest of Stavanger. Subsea pipelines, umbilicals, risers and supporting structures will link the dormant reservoirs to facilities that have processed hydrocarbons from the area for more than half a century. The fields together hold an estimated 55m barrels of recoverable oil equivalent.

That is modest by historic North Sea standards. Yet the timing matters. Norway has become Europe’s most dependable supplier of natural gas, providing roughly 30% of the continent’s imports since Russia’s full-scale invasion of Ukraine. Incremental production from mature basins therefore carries strategic value as well as commercial appeal.

Subsea7 enters the project with a head start. In May 2025 it completed the front-end engineering and design study for ConocoPhillips, giving it a detailed understanding of the reservoirs and the existing infrastructure. Engineering and project management have already begun in Norway. Offshore installation campaigns are planned for 2027 and 2028.

The development also reflects a broader shift on the Norwegian continental shelf. Rather than hunting for costly frontier discoveries, operators are increasingly turning back to fields once judged uneconomic. Advances in subsea technology allow small reservoirs to be tied into existing platforms and processing systems. Reusing infrastructure cuts capital spending, shortens development times and reduces emissions compared with building new facilities from scratch.

For ConocoPhillips the scheme fits a strategy focused on near-field developments with relatively low costs of supply. For Subsea7 it represents one of the larger subsea installation contracts in the Norwegian sector in recent years.

Regulators have yet to approve the formal Plans for Development and Operation. Even so, preparatory work is under way. Ekofisk, first discovered in 1969, helped launch Norway’s petroleum era. Half a century later it is still finding ways to extend it.